pgalloc.h

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
  7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
  8 */
  9#ifndef _ASM_PGALLOC_H
 10#define _ASM_PGALLOC_H
 11
 12#include <linux/highmem.h>
 13#include <linux/mm.h>
 14#include <linux/sched.h>
 15
 16#define __HAVE_ARCH_PMD_ALLOC_ONE
 17#define __HAVE_ARCH_PUD_ALLOC_ONE
 18#include <asm-generic/pgalloc.h>
 19
 20static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 21	pte_t *pte)
 22{
 23	set_pmd(pmd, __pmd((unsigned long)pte));
 24}
 25
 26static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 27	pgtable_t pte)
 28{
 29	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
 30}
 31
 32/*
 33 * Initialize a new pmd table with invalid pointers.
 34 */
 35extern void pmd_init(void *addr);
 36
 37#ifndef __PAGETABLE_PMD_FOLDED
 38
 39static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 40{
 41	set_pud(pud, __pud((unsigned long)pmd));
 42}
 43#endif
 44
 45/*
 46 * Initialize a new pgd table with invalid pointers.
 47 */
 48extern void pgd_init(void *addr);
 49extern pgd_t *pgd_alloc(struct mm_struct *mm);
 50
 51#define __pte_free_tlb(tlb, pte, address)	\
 52	tlb_remove_ptdesc((tlb), page_ptdesc(pte))
 53
 54#ifndef __PAGETABLE_PMD_FOLDED
 55
 56static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 57{
 58	pmd_t *pmd;
 59	struct ptdesc *ptdesc;
 60
 61	ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
 62	if (!ptdesc)
 63		return NULL;
 64
 65	if (!pagetable_pmd_ctor(mm, ptdesc)) {
 66		pagetable_free(ptdesc);
 67		return NULL;
 68	}
 69
 70	pmd = ptdesc_address(ptdesc);
 71	pmd_init(pmd);
 72	return pmd;
 73}
 74
 75#define __pmd_free_tlb(tlb, x, addr)	pmd_free((tlb)->mm, x)
 76
 77#endif
 78
 79#ifndef __PAGETABLE_PUD_FOLDED
 80
 81static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
 82{
 83	pud_t *pud;
 84	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, PUD_TABLE_ORDER);
 85
 86	if (!ptdesc)
 87		return NULL;
 88	pagetable_pud_ctor(ptdesc);
 89	pud = ptdesc_address(ptdesc);
 90
 91	pud_init(pud);
 92	return pud;
 93}
 94
 95static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 96{
 97	set_p4d(p4d, __p4d((unsigned long)pud));
 98}
 99
100#define __pud_free_tlb(tlb, x, addr)	pud_free((tlb)->mm, x)
101
102#endif /* __PAGETABLE_PUD_FOLDED */
103
104extern void pagetable_init(void);
105
106#endif /* _ASM_PGALLOC_H */